As the analysis of boulder-like bauxite ores revealed, they are products of repeated redeposition of substance of eroded bauxite layers. A considerable volume of essentially clayey matter had been formed due to limestones dissolving, weathered
alumosilicates desintegration from the roof of primary bauxite layers, repeated grinding of allitic and bauxitic formations themselves| the clay mass forms the cement in the bauxite boulder-like ores. The ore deposits are located mostly within the limits
Relative-dating studies applied to high-altitude moraines (5 000-5 500 m) in the Rongbuk valley on the northern flank of Mt. Everest reveal strong contrasts in the weathering characteristics of the boulders exposed along moraine crests